otherwise null.
Clipboard.getOwner
gobject.object.ObjectWrap getOwner()If the clipboard contents callbacks were set with [gtk.clipboard.Clipboard.setWithOwner], and the [gtk.clipboard.Clipboard.setWithData] or [gtk.clipboard.Clipboard.clear] has not subsequently called, returns the owner set by [gtk.clipboard.Clipboard.setWithOwner].
Returns
the owner of the clipboard, if any;